Programmatically set oneOutput flag

[danmillwood]

This enhancement enables an application to programatically set the logging.oneOutput flag without needing to expose the klog flags on the command line. It aligns with the existing functions LogToStderr(..) and SetOutputBySeverity(..), such that one can direct messages to different output destinations and control whether those messages are only written to their native severity level.

What this PR does / why we need it:

The enhancement introduces a new function SetOneOutput(bool) that updates the value of the logging.oneOutput flag.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Release note:

addition of SetOneOutput function

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[pohly]

This enhancement enables an application to programatically set the logging.oneOutput flag without needing to expose the klog flags on the command line.

A program doesn't need to do that. See #336

That's the solution that I prefer, not adding more individual API calls.

[danmillwood]

Thanks for the pointer. I hadn't appreciated there was an alternative.